The method
How it is worked out
Repeat monthly: balance × rate ÷ 12, then subtract payment.
- balance
- Starting debt
- rate
- Annual interest rate
- payment
- Monthly payment
Debt Repayment Calculator
Estimate how long a debt takes to repay, total interest and the effect of paying more each month. The result updates as you type so you can compare scenarios quickly.
Keep in mind
What it leaves out
- Changing ratesVariable APRs are not modelled.
- Multiple debtsThis models one blended debt.
- FeesLate fees and penalties are excluded.
Use the calculator to compare scenarios rather than as a guaranteed forecast.
About the Debt Repayment Calculator
Estimate a payoff timetable for one outstanding debt when you can set a regular monthly payment. It helps compare the time and interest cost of paying the minimum you can afford against committing more to the balance.
How it works and an example to tryShow less
How to use the result
The projection adds monthly interest to the outstanding balance and then deducts the payment, repeating until the debt is repaid. If interest consumes the payment, the balance cannot reach zero under that schedule and the tool labels it accordingly. New borrowing, rate changes, penalties and additional fees are not incorporated.
Example to try
Model an overdraft or loan with a 150 monthly payment, then increase that payment without changing the rate. Compare the months saved and interest avoided. Use the amount you can actually sustain rather than the most attractive forecast.
Put it to work
Try it on a real situation
Load an example
What moves the result most
Worked out from your figures above. Tap a row to try it.
Who uses it, and when
Households consolidating debts, anyone choosing between paying off the highest-rate or the smallest balance first, and debt advisers showing clients what an extra fifty a month achieves.
Mistakes worth avoiding
- Setting a repayment you cannot keep up, then giving up on the whole plan.
- Ignoring that a payment barely above the monthly interest will take decades.
- Forgetting late fees and rate rises, which the model does not include.
Questions
What does the Debt Repayment Calculator do?
Estimate how long a debt takes to repay, total interest and the effect of paying more each month.
How should I use the result?
The projection adds monthly interest to the outstanding balance and then deducts the payment, repeating until the debt is repaid. If interest consumes the payment, the balance cannot reach zero under that schedule and the tool labels it accordingly. New borrowing, rate changes, penalties and additional fees are not incorporated.
Does TechBullion store the information I enter?
The core calculation or transformation runs in your browser. Normal website security and analytics may still record page-level events, but the tool does not need to create a public record from your inputs.
What mistakes do people make with a debt repayment calculator?
Setting a repayment you cannot keep up, then giving up on the whole plan. Ignoring that a payment barely above the monthly interest will take decades. Forgetting late fees and rate rises, which the model does not include.
Is the result guaranteed?
No. Use the result as a practical check or planning aid and verify important decisions with the relevant primary source, provider or professional advice.
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Calculator results are estimates based on the figures entered and are not financial, investment, legal or tax advice.